Household poisons are not the only thing that can harm your pets. Many common household foods and drugs can also be toxic to your pets. The following are foods that can be toxic or poisonous to your pets.

Avocados. Avocados contain a toxin known as persin. Persin is found in various parts of the avocado and avocado trees (eg, leaves, rind, etc). This toxin is known mostly to cause vomiting and diarrhea. Birds and small pets seem most affected by the negative side effects of consuming avocado.

Alcohol. Depending on how much alcohol your animal ingests, it can lead to vomiting, diarrhea, depression, difficulty breathing, coma, and possible death .

Chocolate. Chocolate contains a compound called theobromine that is toxic to pets. If enough is ingested, your animal can suffer from vomiting, diarrhea, abnormal heart rhythms, tremors, seizures, and possible death. Cocoa mulch contains theobromine; the ASPCA advises dog owners to avoid using this fertilizer around unsupervised dogs, and dogs with indiscriminate eating habits since it can be toxic if ingested.

Candy. Chocolate is the most common candy that is toxic to pets, especially to dogs, cats, and ferrets. Any candy containing the sweetener xylitol can also be toxic to pets.

Caffeine. Caffeine is generally highly toxic to pets, having negative effects on both the cardiac and nervous systems. Side effects can include vomiting, diarrhea, abnormal heart rhythms, tremors, seizures, and possible death.

Grapes and raisins. An unknown toxin in grapes and raisins can cause kidney failure and ultimately lead to death. Symptoms of this poisoning can include hyperactivity, vomiting, diarrhea, and irregular heartbeat.

Nuts. An unknown toxin in nuts can have negative effects on the nervous, digestive, and muscular systems of your pet. Symptoms can include muscle tremors, weakness, an upset stomach, vomiting, depression, inactivity, and stiffness. Particularly avoid Macadamia nuts.

Onions. Onions, along with garlic and chives, are all part of the same species of plant — the Allium species. Allium species plants contain sulfur compounds that can cause stomach irritation and possibly result in damage to red blood cells causing anemia. This is referred to as Allium poisoning.
Apple Seeds
Chives
Fruit pits, especially
those of apricots, peaches,
plums, nectarines, and
cherries
Moldy foods
Mustard seeds
Potato leaves and stems
Rhubarb leaves
Salt
Tea
Tomato leaves and stems
Toxic Household Items
A study by the pet health insurance company VPI found that these were the top 10 foods and plants involved in pet poisoning claims:
Raisins/Grapes
Mushrooms
Marijuana
Lily flowers
Walnuts
Onion
Sago Palm
Macadamia nuts
Azalea flowers
Hydrangea flowers